The present invention relates to a composition for dyeing keratin fibers, comprising (a) at least one direct dye; and (b) at least one sulfone compound represented by the following formula (I): wherein each of R1 and R2 independently denotes a monovalent C1-30 aliphatic group or a monovalent C6-30 aromatic group, which may optionally be substituted with at least one substituent; or R1 and R2, together with the sulfur atom which they are binding, form a 3-10 membered ring which may optionally be substituted with at least one substituent. The composition according to the present invention is a one-part composition and can prevent or reduce skin staining by the direct dye on the skin such as the scalp, while providing the keratin fibers with good cosmetic effects such as good coloring properties.
本发明涉及一种用于角蛋白纤维染色的组合物,该组合物包含(a)至少一种
直接染料;和(b)至少一种由下式(I)代表的砜类化合物:其中R1和R2各自独立地表示一价C1-30脂肪族基团或一价C6-30芳香族基团,它们可任选被至少一个取代基取代;或R1和R2与它们结合的
硫原子一起形成一个3-10个成员的环,该环可任选被至少一个取代基取代。根据本发明的组合物是单组分组合物,可以防止或减少
直接染料对头皮等皮肤的染色,同时为角蛋白纤维提供良好的美容效果,如良好的着色性能。